- 03 Apr, 2018 24 commits
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Alexei Starovoitov authored
BugLink: http://bugs.launchpad.net/bugs/1755509 [ upstream commit 290af866 ] The BPF interpreter has been used as part of the spectre 2 attack CVE-2017-5715. A quote from goolge project zero blog: "At this point, it would normally be necessary to locate gadgets in the host kernel code that can be used to actually leak data by reading from an attacker-controlled location, shifting and masking the result appropriately and then using the result of that as offset to an attacker-controlled address for a load. But piecing gadgets together and figuring out which ones work in a speculation context seems annoying. So instead, we decided to use the eBPF interpreter, which is built into the host kernel - while there is no legitimate way to invoke it from inside a VM, the presence of the code in the host kernel's text section is sufficient to make it usable for the attack, just like with ordinary ROP gadgets." To make attacker job harder introduce BPF_JIT_ALWAYS_ON config option that removes interpreter from the kernel in favor of JIT-only mode. So far eBPF JIT is supported by: x64, arm64, arm32, sparc64, s390, powerpc64, mips64 The start of JITed program is randomized and code page is marked as read-only. In addition "constant blinding" can be turned on with net.core.bpf_jit_harden v2->v3: - move __bpf_prog_ret0 under ifdef (Daniel) v1->v2: - fix init order, test_bpf and cBPF (Daniel's feedback) - fix offloaded bpf (Jakub's feedback) - add 'return 0' dummy in case something can invoke prog->bpf_func - retarget bpf tree. For bpf-next the patch would need one extra hunk. It will be sent when the trees are merged back to net-next Considered doing: int bpf_jit_enable __read_mostly = BPF_EBPF_JIT_DEFAULT; but it seems better to land the patch as-is and in bpf-next remove bpf_jit_enable global variable from all JITs, consolidate in one place and remove this jit_init() function. Signed-off-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Juerg Haefliger <juergh@canonical.com> Signed-off-by:
Stefan Bader <stefan.bader@canonical.com>
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Juerg Haefliger authored
BugLink: http://bugs.launchpad.net/bugs/1755509 New config option pulled in with the update to stable release 4.4.115. Signed-off-by:
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Alexei Starovoitov authored
BugLink: http://bugs.launchpad.net/bugs/1755509 [ upstream commit 90caccdd ] - bpf prog_array just like all other types of bpf array accepts 32-bit index. Clarify that in the comment. - fix x64 JIT of bpf_tail_call which was incorrectly loading 8 instead of 4 bytes - tighten corresponding check in the interpreter to stay consistent The JIT bug can be triggered after introduction of BPF_F_NUMA_NODE flag in commit 96eabe7a in 4.14. Before that the map_flags would stay zero and though JIT code is wrong it will check bounds correctly. Hence two fixes tags. All other JITs don't have this problem. Signed-off-by:
Martin KaFai Lau <kafai@fb.com> Reviewed-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Eric Dumazet authored
BugLink: http://bugs.launchpad.net/bugs/1755509 [ upstream commit 84ccac6e ] Saves 4 bytes replacing following instructions : lea rax, [rsi + rdx * 8 + offsetof(...)] mov rax, qword ptr [rax] cmp rax, 0 by : mov rax, [rsi + rdx * 8 + offsetof(...)] test rax, rax Signed-off-by:
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Seth Forshee authored
The recent update to handle multiple bugs/cves has an error in the detection of packaging changes, causing them to be denoted as upstream changes in the changelog. Change this logic to check the subject field instead of the non-existent title field. Ignore: yes Signed-off-by:
Seth Forshee <seth.forshee@canonical.com> Acked-by:
Kleber Sacilotto de Souza <kleber.souza@canonical.com> Signed-off-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856Signed-off-by:
Andy Whitcroft <apw@canonical.com> Acked-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856Signed-off-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856Signed-off-by:
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Peter Zijlstra authored
BugLink: http://bugs.launchpad.net/bugs/1758856 The objtool retpoline validation found this indirect jump. Seeing how it's on CPU bringup before we run userspace it should be safe, annotate it. Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by:
David Woodhouse <dwmw@amazon.co.uk> Acked-by:
Thomas Gleixner <tglx@linutronix.de> Acked-by:
Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by:
Ingo Molnar <mingo@kernel.org> (backported from commit bd89004f) Signed-off-by:
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Peter Zijlstra authored
BugLink: http://bugs.launchpad.net/bugs/1758856 Replace indirect call with CALL_NOSPEC. Signed-off-by:
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Peter Zijlstra authored
BugLink: http://bugs.launchpad.net/bugs/1758856 Replace the indirect calls with CALL_NOSPEC. Signed-off-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856Signed-off-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856Signed-off-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856 These are always safe because there is no way rip can be an unknown. Signed-off-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856Signed-off-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856Signed-off-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856 Use the upstream retpoline safe hinting support to clear out known safe retpoline sequences from those detected. At the same time switch to extracting the indirect sequences and associated hints to .o generation time. This allows it to be run on the cache hot data and to be run in parallel on the builders. Signed-off-by:
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Andy Lutomirski authored
BugLink: http://bugs.launchpad.net/bugs/1758856 alternative.h pulls in ptrace.h, which means that alternatives can't be used in anything referenced from ptrace.h, which is a mess. Break the dependency by pulling text patching helpers into their own header. Signed-off-by:
Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/99b93b13f2c9eb671f5c98bba4c2cbdc061293a2.1461698311.git.luto@kernel.orgSigned-off-by:
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Peter Zijlstra authored
BugLink: http://bugs.launchpad.net/bugs/1758856 Paravirt emits indirect calls which get flagged by objtool retpoline checks, annotate it away because all these indirect calls will be patched out before we start userspace. This patching happens through alternative_instructions() -> apply_paravirt() -> pv_init_ops.patch() which will eventually end up in paravirt_patch_default(). This function _will_ write direct alternatives. Signed-off-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1758856 In 9e0e3c51 ("x86/speculation, objtool: Annotate indirect calls/jumps for objtool") we added annotations for CALL_NOSPEC/JMP_NOSPEC on x86 64bit. We did not annotate the 32bit path. Annotate it similarly. [apw@canonical.com: backported to xenial.] Signed-off-by:
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Peter Zijlstra authored
BugLink: http://bugs.launchpad.net/bugs/1758856 Annotate the indirect calls/jumps in the CALL_NOSPEC/JUMP_NOSPEC alternatives. Signed-off-by:
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Steve Beattie authored
BugLink: http://bugs.launchpad.net/bugs/1758856 Catch indirect jmps and calls of the form 'jmp *0xNNNN(%reg)'. Signed-off-by:
Steve Beattie <steve.beattie@canonical.com> Acked-by:
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Andy Whitcroft authored
BugLink: http://bugs.launchpad.net/bugs/1752655Signed-off-by:
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Juerg Haefliger authored
Ignore: yes Signed-off-by:
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- 31 Mar, 2018 4 commits
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Khalid Elmously authored
Signed-off-by:Khalid Elmously <khalid.elmously@canonical.com>
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Khalid Elmously authored
Retpoline files for i386 are empty for the previous ABIs. It has been fixed by commit "UBUNTU: [Packaging] retpoline-extract -- instantiate retpoline files for i386". So ignore the check from the previous ABI files. Ignore: yes Signed-off-by: -
Kai-Heng Feng authored
BugLink: http://bugs.launchpad.net/bugs/1759821 This reverts commit fd865802. This commit causes a regression on some QCA ROME chips. The USB device reset happens in btusb_open(), hence firmware loading gets interrupted. Furthermore, this commit stops working after commit ("a0085f25 Bluetooth: btusb: driver to enable the usb-wakeup feature"). Reset-resume quirk only gets enabled in btusb_suspend() when it's not a wakeup source. If we really want to reset the USB device, we need to do it before btusb_open(). Let's handle it in drivers/usb/core/quirks.c. Cc: stable@vger.kernel.org Cc: Leif Liddy <leif.linux@gmail.com> Cc: Matthias Kaehlcke <mka@chromium.org> Cc: Brian Norris <briannorris@chromium.org> Cc: Daniel Drake <drake@endlessm.com> Signed-off-by:
Kai-Heng Feng <kai.heng.feng@canonical.com> Reviewed-by:
Brian Norris <briannorris@chromium.org> Tested-by:
Marcel Holtmann <marcel@holtmann.org> (cherry picked from commit 7d06d589) Signed-off-by:
Joseph Salisbury <joseph.salisbury@canonical.com> Acked-by:
Brad Figg <brad.figg@canonical.com> Acked-by:
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Khalid Elmously authored
Ignore: yes Signed-off-by:
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- 28 Mar, 2018 5 commits
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Khalid Elmously authored
Signed-off-by: -
Khalid Elmously authored
Retpoline files for i386 are empty for the previous ABIs. It has been fixed by commit "UBUNTU: [Packaging] retpoline-extract -- instantiate retpoline files for i386". So ignore the check from the previous ABI files. Ignore: yes Signed-off-by: -
Borislav Petkov authored
BugLink: http://bugs.launchpad.net/bugs/1758869 commit a15a7535 upstream with minor adjustments. Doing so is completely void of sense for multiple reasons so prevent it. Set dis_ucode_ldr to true and thus disable the microcode loader by default to address xen pv guests which execute the AP path but not the BSP path. By having it turned off by default, the APs won't run into the loader either. Also, check CPUID(1).ECX[31] which hypervisors set. Well almost, not the xen pv one. That one gets the aforementioned "fix". Also, improve the detection method by caching the final decision whether to continue loading in dis_ucode_ldr and do it once on the BSP. The APs then simply test that value. Signed-off-by:
Borislav Petkov <bp@suse.de> Tested-by:
Juergen Gross <jgross@suse.com> Tested-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com> Acked-by:
Rolf Neugebauer <rolf.neugebauer@docker.com> (back-ported from commit a15a7535) Reference: https://lkml.org/lkml/2018/2/8/455Acked-by:
Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Signed-off-by:
Kamal Mostafa <kamal@canonical.com>
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Wei Yongjun authored
CVE-2018-8043 platform_get_resource() may fail and return NULL, so we should better check it's return value to avoid a NULL pointer dereference a bit later in the code. This is detected by Coccinelle semantic patch. @@ expression pdev, res, n, t, e, e1, e2; @@ res = platform_get_resource(pdev, t, n); + if (!res) + return -EINVAL; ... when != res == NULL e = devm_ioremap(e1, res->start, e2); Signed-off-by:
Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by:
Po-Hsu Lin <po-hsu.lin@canonical.com> Acked-by:
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Stefan Bader authored
Ignore: yes Signed-off-by:
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- 13 Mar, 2018 7 commits
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Kleber Sacilotto de Souza authored
Signed-off-by: -
Kleber Sacilotto de Souza authored
Retpoline files for i386 are empty for the previous ABIs. It has been fixed by commit "UBUNTU: [Packaging] retpoline-extract -- instantiate retpoline files for i386". So ignore the check from the previous ABI files. Ignore: yes Signed-off-by: -
Greg Kroah-Hartman authored
BugLink: http://bugs.launchpad.net/bugs/1754592Signed-off-by:
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Ben Hutchings authored
BugLink: http://bugs.launchpad.net/bugs/1754592 commit 19952667 upstream. Commit bdcf0a42 ("kernel: make groups_sort calling a responsibility group_info allocators") appears to break nfsd rootsquash in a pretty major way. It adds a call to groups_sort() inside the loop that copies/squashes gids, which means the valid gids are sorted along with the following garbage. The net result is that the highest numbered valid gids are replaced with any lower-valued garbage gids, possibly including 0. We should sort only once, after filling in all the gids. Fixes: bdcf0a42 ("kernel: make groups_sort calling a responsibility ...") Signed-off-by:
Ben Hutchings <ben.hutchings@codethink.co.uk> Acked-by:
J. Bruce Fields <bfields@redhat.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Cc: Wolfgang Walter <linux@stwm.de> Signed-off-by:
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Dan Streetman authored
BugLink: http://bugs.launchpad.net/bugs/1754592 [ Upstream commit 4ee806d5 ] When a tcp socket is closed, if it detects that its net namespace is exiting, close immediately and do not wait for FIN sequence. For normal sockets, a reference is taken to their net namespace, so it will never exit while the socket is open. However, kernel sockets do not take a reference to their net namespace, so it may begin exiting while the kernel socket is still open. In this case if the kernel socket is a tcp socket, it will stay open trying to complete its close sequence. The sock's dst(s) hold a reference to their interface, which are all transferred to the namespace's loopback interface when the real interfaces are taken down. When the namespace tries to take down its loopback interface, it hangs waiting for all references to the loopback interface to release, which results in messages like: unregister_netdevice: waiting for lo to become free. Usage count = 1 These messages continue until the socket finally times out and closes. Since the net namespace cleanup holds the net_mutex while calling its registered pernet callbacks, any new net namespace initialization is blocked until the current net namespace finishes exiting. After this change, the tcp socket notices the exiting net namespace, and closes immediately, releasing its dst(s) and their reference to the loopback interface, which lets the net namespace continue exiting. Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711407 Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=97811Signed-off-by:
Dan Streetman <ddstreet@canonical.com> Signed-off-by:
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Eric Dumazet authored
BugLink: http://bugs.launchpad.net/bugs/1754592 [ Upstream commit d0c081b4 ] syzbot reported yet another crash [1] that is caused by insufficient validation of DODGY packets. Two bugs are happening here to trigger the crash. 1) Flow dissection leaves with incorrect thoff field. 2) skb_probe_transport_header() sets transport header to this invalid thoff, even if pointing after skb valid data. 3) qdisc_pkt_len_init() reads out-of-bound data because it trusts tcp_hdrlen(skb) Possible fixes : - Full flow dissector validation before injecting bad DODGY packets in the stack. This approach was attempted here : https://patchwork.ozlabs.org/patch/ 861874/ - Have more robust functions in the core. This might be needed anyway for stable versions. This patch fixes the flow dissection issue. [1] CPU: 1 PID: 3144 Comm: syzkaller271204 Not tainted 4.15.0-rc4-mm1+ #49 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:355 [inline] kasan_report+0x23b/0x360 mm/kasan/report.c:413 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:432 __tcp_hdrlen include/linux/tcp.h:35 [inline] tcp_hdrlen include/linux/tcp.h:40 [inline] qdisc_pkt_len_init net/core/dev.c:3160 [inline] __dev_queue_xmit+0x20d3/0x2200 net/core/dev.c:3465 dev_queue_xmit+0x17/0x20 net/core/dev.c:3554 packet_snd net/packet/af_packet.c:2943 [inline] packet_sendmsg+0x3ad5/0x60a0 net/packet/af_packet.c:2968 sock_sendmsg_nosec net/socket.c:628 [inline] sock_sendmsg+0xca/0x110 net/socket.c:638 sock_write_iter+0x31a/0x5d0 net/socket.c:907 call_write_iter include/linux/fs.h:1776 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x1f/0x96 Fixes: 34fad54c ("net: __skb_flow_dissect() must cap its return value") Fixes: a6e544b0 ("flow_dissector: Jump to exit code in __skb_flow_dissect") Signed-off-by:
syzbot <syzkaller@googlegroups.com> Acked-by:
Jason Wang <jasowang@redhat.com> Signed-off-by:
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Jim Westfall authored
BugLink: http://bugs.launchpad.net/bugs/1754592 [ Upstream commit cd9ff4de ] Map all lookup neigh keys to INADDR_ANY for loopback/point-to-point devices to avoid making an entry for every remote ip the device needs to talk to. This used the be the old behavior but became broken in a263b309 (ipv4: Make neigh lookups directly in output packet path) and later removed in 0bb4087c (ipv4: Fix neigh lookup keying over loopback/point-to-point devices) because it was broken. Signed-off-by:
Jim Westfall <jwestfall@surrealistic.net> Signed-off-by:
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